Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/crypto/dh/dh_asn1.c

@@ -0,0 +1,160 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2000.
+ */
+/* ====================================================================
+ * Copyright (c) 2000-2005 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <openssl/dh.h>
+
+#include <assert.h>
+#include <limits.h>
+
+#include <openssl/bn.h>
+#include <openssl/bytestring.h>
+#include <openssl/err.h>
+
+#include "../bytestring/internal.h"
+
+
+static int parse_integer(CBS *cbs, BIGNUM **out) {
+  assert(*out == NULL);
+  *out = BN_new();
+  if (*out == NULL) {
+    return 0;
+  }
+  return BN_parse_asn1_unsigned(cbs, *out);
+}
+
+static int marshal_integer(CBB *cbb, BIGNUM *bn) {
+  if (bn == NULL) {
+    /* A DH object may be missing some components. */
+    OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER);
+    return 0;
+  }
+  return BN_marshal_asn1(cbb, bn);
+}
+
+DH *DH_parse_parameters(CBS *cbs) {
+  DH *ret = DH_new();
+  if (ret == NULL) {
+    return NULL;
+  }
+
+  CBS child;
+  if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
+      !parse_integer(&child, &ret->p) ||
+      !parse_integer(&child, &ret->g)) {
+    goto err;
+  }
+
+  uint64_t priv_length;
+  if (CBS_len(&child) != 0) {
+    if (!CBS_get_asn1_uint64(&child, &priv_length) ||
+        priv_length > UINT_MAX) {
+      goto err;
+    }
+    ret->priv_length = (unsigned)priv_length;
+  }
+
+  if (CBS_len(&child) != 0) {
+    goto err;
+  }
+
+  return ret;
+
+err:
+  OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR);
+  DH_free(ret);
+  return NULL;
+}
+
+int DH_marshal_parameters(CBB *cbb, const DH *dh) {
+  CBB child;
+  if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
+      !marshal_integer(&child, dh->p) ||
+      !marshal_integer(&child, dh->g) ||
+      (dh->priv_length != 0 &&
+       !CBB_add_asn1_uint64(&child, dh->priv_length)) ||
+      !CBB_flush(cbb)) {
+    OPENSSL_PUT_ERROR(DH, DH_R_ENCODE_ERROR);
+    return 0;
+  }
+  return 1;
+}
+
+DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) {
+  if (len < 0) {
+    return NULL;
+  }
+  CBS cbs;
+  CBS_init(&cbs, *inp, (size_t)len);
+  DH *ret = DH_parse_parameters(&cbs);
+  if (ret == NULL) {
+    return NULL;
+  }
+  if (out != NULL) {
+    DH_free(*out);
+    *out = ret;
+  }
+  *inp = CBS_data(&cbs);
+  return ret;
+}
+
+int i2d_DHparams(const DH *in, uint8_t **outp) {
+  CBB cbb;
+  if (!CBB_init(&cbb, 0) ||
+      !DH_marshal_parameters(&cbb, in)) {
+    CBB_cleanup(&cbb);
+    return -1;
+  }
+  return CBB_finish_i2d(&cbb, outp);
+}